Different qualities of gas could make this change. But I would'nt think that much of a difference. Have you changed the air filter? Thats a start and running a bottle of that fuel injector cleaner would help too to clean out clogs.
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2001 Ford Ranger Supercab 4X4 4.0 SOHC, Airaid Cool Intake
4.10 Gear Ratio, Flowmaster Cat-Back Exhaust with a Delta 40 series muffler
265/75/16 Sport King AT's, with Procomp Xtreme Chrome Wheels
4 Kicker KS 680 speakers, and Pioneer Head Unit
Light Bar/License Plate Holder with 2 KC Daylighters
A.R.E Fiberglass Top, Bushwacker Fender Flares
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Fuel economy
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